.1.1 T-Mobile 7:50 AM 87%- Expt N-Phase Changes-1.pdf Experiment N: Solids, Liqu

Question

.1.1 T-Mobile 7:50 AM 87%- Expt N-Phase Changes-1.pdf Experiment N: Solids, Liquids, Gases and Phase Changes Go to this website Click RUN (or download onto your computer) You will need JAVA to perform this experiment...please make sure that the internet browser you are using can download/support this software application. You may also need to over-ride your security settings to open this app. You will see on the right, a choice of 4 chemicals (Ne, Ar, O2 and H20) Choose one of the chemicals at a time. Choose a phase and record the temperature shown on the thermometer for that substance a phase in the data table. Then choose the next 2 phases and record those temperatures too. Do this for all 4 chemicals for all 3 phases. Record those temperatures in the table Once you have recorded those12 temperature (3/substance x 4 substances), please fill in the rows as requested for the 4 chemicals. Use the internet, your text or a reference book to lool data as needed. Lastly, answer the questions posed. Data Sheet Ne Ar O2 H20 Temp shown for solid Temp shown for liquid Temp shown for gas Temp shown for solid in °C Temp shown for liquid in °C Temp shown for gas in °C MPt in C (to be looked up) BPt in °C (to be looked up) Molar Mass Courses Calendar To Do Notifications Messages

Explanation / Answer

Q1

phases of

Ne --> neon is a noble gas, will be gas at room T.

Ar --> argon is a noble gas, will be gas at room T.

O2 --> Oxygen is gas at 25°C, since it has low dispersion forces

H2O --> dipolar + Hydrogen bonding --> expect strong interactions, this is LIQUID

Q2.

IMF:

- Dispersion forces --> present mainly due to small arrangement of electrons which mark a positive/negative dispersions. Also known as Wan der Waals or London forces. Are the weakest of all

- Dipole-dipole forces --> forces between polar molecules, they ar formed due to electronegativt elements in the chemical species. Will form a positive and negative overall dipoles. They are stronger than dspersion forces

- Hydrogen bonding ---> Formed between polar + H. Also plese note that for Hydrogen bonding, we must have the next conditions:

- Species is polar, i.e. there are dipole-dipole interactions between the molecules

- There must be an acidic Hydrogen bonded directly to either, N,O,F; which are very electronegative species.

a)

weakest --> dispersion

strongest --> dipole + H-bonding

Q3.

Ne, Ar, O2 --> nonpolar samples so only dispersion forces

H2O --> dispersion forces + dipole-diple + hydrogen bonding --> has all forces

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